001/* 002 * Copyright 2002-2018 the original author or authors. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * https://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017package org.springframework.context.annotation; 018 019import java.lang.annotation.Documented; 020import java.lang.annotation.ElementType; 021import java.lang.annotation.Retention; 022import java.lang.annotation.RetentionPolicy; 023import java.lang.annotation.Target; 024 025/** 026 * Beans on which the current bean depends. Any beans specified are guaranteed to be 027 * created by the container before this bean. Used infrequently in cases where a bean 028 * does not explicitly depend on another through properties or constructor arguments, 029 * but rather depends on the side effects of another bean's initialization. 030 * 031 * <p>A depends-on declaration can specify both an initialization-time dependency and, 032 * in the case of singleton beans only, a corresponding destruction-time dependency. 033 * Dependent beans that define a depends-on relationship with a given bean are destroyed 034 * first, prior to the given bean itself being destroyed. Thus, a depends-on declaration 035 * can also control shutdown order. 036 * 037 * <p>May be used on any class directly or indirectly annotated with 038 * {@link org.springframework.stereotype.Component} or on methods annotated 039 * with {@link Bean}. 040 * 041 * <p>Using {@link DependsOn} at the class level has no effect unless component-scanning 042 * is being used. If a {@link DependsOn}-annotated class is declared via XML, 043 * {@link DependsOn} annotation metadata is ignored, and 044 * {@code <bean depends-on="..."/>} is respected instead. 045 * 046 * @author Juergen Hoeller 047 * @since 3.0 048 */ 049@Target({ElementType.TYPE, ElementType.METHOD}) 050@Retention(RetentionPolicy.RUNTIME) 051@Documented 052public @interface DependsOn { 053 054 String[] value() default {}; 055 056}